Type 347 stainless steel has slightly improved corrosion resistance over type 321 stainless steel in strongly oxidizing environments. Type 347 stainless steel is stabilized with columbium, it is preferable for aqueous and low temperature environments due to its good resistance to intergranular attack. Both 347 stainless steel and 321 stainless steel offer good resistance to polythionic acid stress corrosion cracking, encountered in oil refineries. The high temperature oxidation resistance of 347 stainless steel is similar to that of 304 stainless steel. Useful to 1500°F.
Often in many product forms, the grain size and carbon content can meet both the 347S and 347H requirements. Appropriate weld fillers are AWS ER347 bare wire and E347 covered electrodes.
Chemistry
| Cr | Ni | Cb + Ta | C | Si | Mn | P | S | Fe | |
|---|---|---|---|---|---|---|---|---|---|
| MIN | 17.0 | 9.0 | Cb 10xc (Cb 8xC) | 0.04 | - | - | - | - | |
| MAX | 19.0 | 13.0 | 1.0 | 0.08 | 0.75 | 2.0 | 0.045 | 0.03 | Balance |
Specifications
AMS 5512, AMS 5646, AMS 5680
ASME SA 240
ASTM A 240, ASTM A 269, ASTM A 479, ASTM A262 Practice E
MSRR 5632
PWA 300, PWA F17 LCS
UNS S34700, UNS S34709
W. Nr./EN 1.4550
Inventory
347 Stainless Steel Flanges, 347 Stainless Steel Angle Bar, 347 Stainless Steel Tubes, 347 stainless steel Pipe Fittings, 347 Stainless Steel Bars
Common Trade Names
347 Stainless Steel, 347 Stainless
Features
- Good creep strength up to 1500°F
- Maintains good corrosion resistance in applications where the temperature is between 800°F and 1500°F.
- Good resistance to intergranular corrosion in the as welded condition.
Applications
- Oil Refineries
- Fluid catalytic cracking units (FCC)
- Stainless Steel Pipes
- Recuperator stainless steel pipe fittings
- Especially where temperatures exceed 550°F and resistance to sulfidation is needed
- Fired heater stainless steel tubes
- Distributor trays and thermowells
- Equipment in and around reactors (good resistance to polythionic acid)
- Stainless Steel Flanges
Physical Properties
Density: 0.286 lb/inch3
Melting Point: 2550 - 2635°F
Melting Point: 2550 - 2635°F
| Temperature, °F | 70 | 212 | 932 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 9.2 | - |
| Thermal Conductivity Btu • ft/ft2 • hr • °F | - | 112.5 | 147.7 |
| Modulus of Elasticity, Dynamic psi x 106 | 28 | - | - |
* 70°F to indicated temperature.
Mechanical Properties
Minimum Specified Properties, ASTM A 240
| Tensile Strength, ksi | 75 |
| 0.2% Yield Strength, ksi | 30 |
| Elongation, % | 40 |
| Hardness Max, Brinell | 201 |
Typical Tensile and Impact Properties
| Temperature, °F | 68 | 400 | 800 | 1000 | 1200 | 1350 | 1500 |
| Ultimate Tensile Strength, ksi | 93.3 | 73.6 | 69.5 | 63.5 | 52.3 | 39.3 | 26.4 |
| 0.2% Yield Strength, ksi | 36.5 | 36.6 | 29.7 | 27.4 | 24.5 | 22.8 | 18.6 |
* Above data from Zhejiang Yaang Pipe Industry Co., Limited
About Zhejiang Yaang Pipe Industry Co., Limited
Established in 2008, Zhejiang Yaang Pipe Industry Co., Limited is a professional organizer and one-stop-shop supplier for steel piping system products, including stainless steel pipes and stainless steel tubes, stainless steel forged flanges and butt-welding stainless steel pipe fittings, stainless steel pipe fittings, stainless steel elbows, stainless steel tees, stainless steel reducer, stainless steel stub end, stainless steel gaskets, stainless steel fasteners, stainless steel valves, Sanitary Services etc. in China. We have devoted to providing the best solutions of steel materials and industrial equipment for our respected customers.
We supply not only commonly used stainless steel materials (SS304/L,SS316/L,SS321), but also duplex and super duplex steel 1.4547, 1.4462, 1.4410 (S31254,S31803,S32750,S32760), special austenite stainless 310S, 347H, 347, 317L, 904L... Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining,Sewage treatment, Natural gas and Pressure vessels and other industries.
We supply not only commonly used stainless steel materials (SS304/L,SS316/L,SS321), but also duplex and super duplex steel 1.4547, 1.4462, 1.4410 (S31254,S31803,S32750,S32760), special austenite stainless 310S, 347H, 347, 317L, 904L... Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining,Sewage treatment, Natural gas and Pressure vessels and other industries.
